Core-box plate



D. J. CAMPBELL.

CORE BOX PLA TE. APPLICATION FILED MAR. 21. 1921.

13325 Patented Ot. 17, 192:2

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D. J. CAMPBELL.

CORE BOX PLATE.

APPLICATION FILED MAR. 21

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UNHTEED) STATES DONALD J. CAMPBELL, 9F IJIUSKEGON HEIGHTS,

rennet earner @FF-HQE.

MICHIGAN, ASBIGHQE 0E ONE-THERE) T0 IRA A. 'WYANT, 0F MUSKEGQN, MICHIGAN.

CORE-BOX PLATE.

Application filed March. 21, 1923. serial 2V0. 154,192. I

invented certain new and useful Improve;

ments in Core-Box Plates; and I do hereby declare the followin to be a full, clear, and

exact description 0 the invention, suchas will enable others skilled in the art to what it appertains to make and use the same.

ThlS invention relates to a plate adapted for use in the compressed air ramming of cores or similar moulds from sand, preferably, green sand. It is designed to use this plate with a box in which the core or mould is formed, the plate being detachable from the box and the cores or moulds coming away from the box therewith, said plate with attached core moulds being then used as the lower portion or drag of a complete mould, the cope being added thereto for the completion of the mould. It is a primary object and purpose of the present invention to make a plate of this character which is adapted to be detachably connected to said core box mould and through which sand under the compulsion of compressed air may be forced into the mould, and directed thereinto through suitable passages and guides in the plate so as to produce a sand mould of proper density and of even density throughout whereby the castings obtained therefrom shall be uniform and substantially perfect. A further object of the invention is to produce a novel construction of plate of this character in an economical manner and at low cost, it being obvious that for the quantity production of the cores, substantially at the rate of one per minute as designed, a large number of plates must be used and the same cannot be excessive in cost and should be made at as low cost as possible. These and various other objects and purposes will appear fully and in detail as understanding of the invention is had from the following description, taken in connection with the accompanying drawings, in which,

Fig. 1 is a transverse vertical section showing my invention of core box plate in use on a core box mould or form and between the same and the sand hop-per from which feed the sand is forced through the plate into the core box.

1F ig. 2 is a section through the plate after the moulds havebeen made and the plate detached from the core box.

Fig. 3 is a plan of the plate. Fi 4 is a vertical section through a moditorm of plate, the sand guides into the core box being modified in construction.

Fig. 5 is a similar view of a still further modification in the sand guide portions of the plate,'and

Fig. 6 is a perspective view of the sand guide construction used with the modification shown in Fig. 5.

Like reference characters refer to like parts in the different figures of the draw- 1n n the construction, the plate 1 is of cast metal and excepting the sand guides, later described, is a single integral casting easily produced. Two oppositely extending arms 2 are formed therewith in which bushings like those described in the application Ser. No. 373,056, of George W. Cannon, filed April 20, 1920, are secured as indicated at 3, the bushings serving as receivers for detachable guide pins for guiding the cope of the mould into place with respect to the drag, of which the plate is a part after the cores are formed thereon. This plate at a number of points, four as shown in the illustration, at adjacent the four corners thereof has raised portions 4:, all in the same horizontal plane through which relatively large circular openings 5 are made. At its central portion said plate 1 is also provided with a raised portion or section 6, the upper side of which lies in a horizontal plane slightly below the plane of the upper surfaces of portions 4. A series of small openings 7 are made through the section 6 communicating with the open space 8 under the plate and between it and the core; box below the plate and with which it is associated.

The openings 5 through the plate are cut downwardly and outwardly at an angle so that the passages through the plate under the openings have downwardly and outwardly inclined sides 9 as shown. Within each passage a sand guide member 10 is located, the same being frusto-conical in form with downwardly and outwardly inclined outer sides 11, the angle of inclination of which to the vertical is less than that of the sides 9, so that the passage between the sides of the aide member 10 and the inclined sides 9 widens gradually in a downward direction. Each member 10 has a vertical passage therethrough the sides of which are vertical at the upper portion of the passage, as indicated at 12 but said passage at its lower end is progressively enlarged, the sides 12 curving outwardly and downwardly as shown at 13. The gu de members are held in position rigidly with respect to the plate 1, integral arms 14 thereon spaced apart around each member 10 coming at their outer ends against the inclined sides of the passages through the plate, screws 15 threa 'ing through the plate into the ends of said arms 14.

In the use of this plate, a relatively thin plate 16 is placed over and against the upper side of the plate 1, it having openings 17 coming directly above the passages through the members 10, and other openings 18 above the passages between said members 10 and the inclined'sides 9 described. A sand ho per is located directly over plate 16 and in engagement therewith. This sand hopper has an outer shell 19 and an inner core 20 with various passages 21 directed downwardly toward the openings 17 and 18 and a central passage 22 having lower branches 23 communicating with the main passages 21 as shown. The particular structure of the hopper is the subject matter of another a )plication for patent Ser. No. 454,193, filed arch 21, 1921, and is not fully described and shown herein.

The plate 1 is placed over and against a construction of core box mould lying against the upper plate 24 thereof in which openings 25 are made under the sand guide members 10 and larger in diameter than the lower ends of said guide members. The plate 24 is attached at the upper side of an outer housing 26 in which master box members 27 are mounted, inside of which side core forms 29 are located and'connected to the master box members. A base member 28 with end core forms 30 attached thereto closes the lower side of the housing, the end core forms 30 completing the form for the cores to be made. This specific construction of the core box is the subject matter of a separate application for patent Serial Number 443,7 38, filed Feb. 10, 1921, and the way that the core forms are separated for the withdrawal of the cores made is described therein.

The hopper, above the plate 16 being filled with sand, the same is forced through compressed air pressure through opemngs 17 and 18 into the sand guides 10 and into the spaces around-said guides, completely filling the open spaces under the plate. The sand also passes through the guide members 10 and thence into the core forms. By reason of the shape of the passa es through the members 10, the sand is held from expansion until it practically reaches the s aces within the core forms, then spreads an completely fills the same with an even pressure, the same being of like density throughout. The sand is also carried into the space 8, fillin the same completely, and the air pressure is relieved through the openings 7 in the central raised section 6.

It is apparent that the formation of the guides for the sand holds the sand under full pressure of the air until the desired points of deposit of the sand are reached, there being no wasteful expansion and loss of compressed air during the passage of the sand to the forms or moulds. The sand in the core forms and in the plate is a continuous homogenous mass and when the core box is moved from under the hopper, turned over and the plate detached and drawn therefrom, a mould drag is made, consisting of the plate 1, the mass of sand 31 .therein and the integral sand cores 32 extending upwardly therefrom, as shown in Fig. 2. This drag may becovered with a properl formed cope for the completion of the moul In the present instance the cores made are for pistons of engines, but the invention is not limited in use to making the one kind of mould or core.

In Fig. 4, a slight modification'in struc ture is shown, each sand guide member 10 having a smaller yet similar guide 10, attached thereto at its lower end, having outer inclined sides 11", a central passa therethrough the upper ortion of w ich has vertical sides 12 leadlng into outwardl and downwardly curved lower sides 13. hese additional smaller guidemembers are con-.

These ad itional and aux1liary guide membersare of value in carrying the sand .under full pressure to lower parts of the core forms and under. projections therein not readily reached, or at least not reached as well with the single snag guide members 10. In all cases, the sand IS carried under full pressure, of the air substantially to 'its point of deposit, and the plate constructions described are for the purpose of husbanding the pressure and not allowing it to dissipate or become lowered by too early expansion. The construction described is practical and has proved its utility in practice. The invention is defined in the appended claims and I consider myself entitled to all con structions coming within their scope.

I claim:

1. A device of the character described, comprising a plate provided with an opening therethrough, and a sand guide member located in said opening and having sides spaced from the sides of the opening and also provided with a central passage therethrou h, substantially as described.

2. E device of the character described comprising a relatively thick plate provided with a vertical passage therethrough, the sides of which extend downwardly and outwardly at an angle to the vertical, and a sand guide member located vertically in said passage and having sides spaced from the sides of the passage and also provided with a central vertical passage therethrough, the lower portion of which progressively enlarges toward the lower end of said member, substantially as described.

3. A device of the character described, comprising a relatively thick plate provided with a vertical passage therethrough, the sides of which extend downwardly and outwardly at an angle to the vertical, and a sand guide member located vertically in said passage and having downwardly and outwardly inclined sides spaced from the sides of the passage, said sides of the sand guide member being at an angle to the vertical less than the angle of the sides of the passage, and said guide member having a vertical passage therethrough, the lower portion of which is flared outwardly and progressively enlarged toward the lower end of said member, substantially as described.

4. A device of the character described, comprising a relatively thick plate provided with a vertical passage therethrough, a sand guide member located vertically in said passage and having its sides spaced from the sides of the passage, and spaced apart arms extending from said ,sand guide member and connected at their outer ends to the plate, substantially as described.

5. A device of the character described, comprising a relatively thick plate having a plurality of spaced apart raised portions thereon the upper sides of which are all in the same horizontal plane, each of said raised portions having an opening therethrough passing through the plate thereby making vertical passages through. the plate, and a sand guide member located vertically in each passage and having sides spaced from the sides of its associated passage and also provided with a central passage therethrough, substantially as described.

6. A device of the character described, comprising a relatively thick plate having a plurality of spaced apart raised portions thereon, the upper sides of which are all in the same horizontal plane, and also provided with an additional raised portion centrally disposed with respect to the first raised portions and with its upper side located in a plane slightly below the plane of the first raised portions, said additional raised portion bein provided with an open space below it an with a plurality of small openings therethrough connecting with said open space, said first raised portions each having an opening therethrough passing through the plate to make vertical passages therethrough which connect with the open space below the additional raised portion, and a sand guide member located vertically in each passage and having sides spaced from the sides of its associated passage and also provided with a central vertical passage therethrough, substantially as described.

7. A construction containing the elements in combination defined in claim 1, combined with a second smaller sand guide member attached to and depending below the first sand guide member, said second guide member also having a central passage of smaller size therethrough in substantial alinement with the passage through the first sand guide member.

8. A construction containing the elements in combination defined in claim 1, combined with a plurality of progressively smaller sand guide members attached in alinement with the first guide member and depending below the same, and each having a central passage therethrough with the central axis of all of the passages through the sand guide members substantially coincident, substantially as described.

9. A device of the character described, comprising a relatively thick plate provided with a vertical passage therethrough, a sand; guide member located vertically in said passage and having its sides spaced from the sides of the passage, a plurality of spaced apart arms extending from said sand guide member to the plate, means attaching said arms at their outer ends to the plate, a second smaller guide member located below and in alinement with the first guide member, and means for attaching said second guide member to the lower end of the first guide member, each of said guide members having a central vertical passage therethrough, progressively enlarged at its lower end, and the upper end of the second guide member extending a short distance into the lower end of the passage through the first guide member, substantially as described.

10. A device of the character described, comprising a relatively thick plate having a vertical passage therethrough, a sand guide to the thickness of the plate located in the passage and having sides spaced from the sides of the passage, means for securing the sand guide member in said passage, said guide member having a central vertical passage therethrough, the sldes of the upper portion of WhlCh are vertical, and whlch at their lower portion are curved outwardly and downwardly, substantially as described.

11. A deviceof the character described comprising a relatively thick plate adapted to be positioned between a sand containing hopper and a box adapted to receive sand from the hopper, said plate being provided with a vertical passage therethrough the DONALD J. CAMPBELL. 

